Abstract
The transient temperature gradient driven flow through a microporous ceramic medium is analyzed experimentally. The steady state characteristic of this flow, the Thermomolecular Pressure Difference (TPD), is measured for five gases; helium, neon, nitrogen, argon, and krypton. The TPD is reached when the temperature driven flow is counterbalanced by the pressure driven flow generated by it. Transient measurements of the pressure evolution at hot and cold side of the porous sample allow the extraction of the pressure relaxation time, then the mass flow rate through the medium. Only for helium the mass flow rate is measured in large range of the rarefaction parameter, and it has the Gaussian type shape. The quasi analytical expression for the relaxation time is proposed and compared with the measured data. Experimental characterization of the temperature driven flow could be helpful for further development of the Knudsen pumps.
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